![]() ![]() ![]() The foundation wall will be the coldest surface and is where moisture would condense. The other issue is that you want the insulation on the OUTSIDE of the stud wall. Foam board is permeable, and the idea is that if water ever got on one side or the other, it could eventually dry to the other. Instead, use foam board for the insulation. The modern recommendation (at least in colder climates) is to not use any vapor barrier in an old basement. That will only trap moisture inside the walls. You don't want your electrical cables rubbing up against the bare steel edges.īarrier (tar paper) on all exterior walls, Framing a stud wall, insulating, installing a vapour barrier, and dry-walling over topįor starters, your plan involves two vapor barriers.that is a really bad idea.
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